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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package actions
import (
"bufio"
"context"
"fmt"
"io"
"os"
"strings"
"time"
"code.gitea.io/gitea/models/dbfs"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/storage"
"code.gitea.io/gitea/modules/zstd"
runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
"google.golang.org/protobuf/types/known/timestamppb"
)
const (
MaxLineSize = 64 * 1024
DBFSPrefix = "actions_log/"
timeFormat = "2006-01-02T15:04:05.0000000Z07:00"
defaultBufSize = MaxLineSize
)
// WriteLogs appends logs to DBFS file for temporary storage.
// It doesn't respect the file format in the filename like ".zst", since it's difficult to reopen a closed compressed file and append new content.
// Why doesn't it store logs in object storage directly? Because it's not efficient to append content to object storage.
func WriteLogs(ctx context.Context, filename string, offset int64, rows []*runnerv1.LogRow) ([]int, error) {
flag := os.O_WRONLY
if offset == 0 {
// Create file only if offset is 0, or it could result in content holes if the file doesn't exist.
flag |= os.O_CREATE
}
name := DBFSPrefix + filename
f, err := dbfs.OpenFile(ctx, name, flag)
if err != nil {
return nil, fmt.Errorf("dbfs OpenFile %q: %w", name, err)
}
defer f.Close()
stat, err := f.Stat()
if err != nil {
return nil, fmt.Errorf("dbfs Stat %q: %w", name, err)
}
if stat.Size() < offset {
// If the size is less than offset, refuse to write, or it could result in content holes.
// However, if the size is greater than offset, we can still write to overwrite the content.
return nil, fmt.Errorf("size of %q is less than offset", name)
}
if _, err := f.Seek(offset, io.SeekStart); err != nil {
return nil, fmt.Errorf("dbfs Seek %q: %w", name, err)
}
writer := bufio.NewWriterSize(f, defaultBufSize)
ns := make([]int, 0, len(rows))
for _, row := range rows {
n, err := writer.WriteString(FormatLog(row.Time.AsTime(), row.Content) + "\n")
if err != nil {
return nil, err
}
ns = append(ns, n)
}
if err := writer.Flush(); err != nil {
return nil, err
}
return ns, nil
}
func ReadLogs(ctx context.Context, inStorage bool, filename string, offset, limit int64) ([]*runnerv1.LogRow, error) {
f, err := OpenLogs(ctx, inStorage, filename)
if err != nil {
return nil, err
}
defer f.Close()
if _, err := f.Seek(offset, io.SeekStart); err != nil {
return nil, fmt.Errorf("file seek: %w", err)
}
scanner := bufio.NewScanner(f)
maxLineSize := len(timeFormat) + MaxLineSize + 1
scanner.Buffer(make([]byte, maxLineSize), maxLineSize)
var rows []*runnerv1.LogRow
for scanner.Scan() && (int64(len(rows)) < limit || limit < 0) {
t, c, err := ParseLog(scanner.Text())
if err != nil {
return nil, fmt.Errorf("parse log %q: %w", scanner.Text(), err)
}
rows = append(rows, &runnerv1.LogRow{
Time: timestamppb.New(t),
Content: c,
})
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("ReadLogs scan: %w", err)
}
return rows, nil
}
const (
// logZstdBlockSize is the block size for zstd compression.
// 128KB leads the compression ratio to be close to the regular zstd compression.
// And it means each read from the underlying object storage will be at least 128KB*(compression ratio).
// The compression ratio is about 30% for text files, so the actual read size is about 38KB, which should be acceptable.
logZstdBlockSize = 128 * 1024 // 128KB
)
// TransferLogs transfers logs from DBFS to object storage.
// It happens when the file is complete and no more logs will be appended.
// It respects the file format in the filename like ".zst", and compresses the content if needed.
func TransferLogs(ctx context.Context, filename string) (func(), error) {
name := DBFSPrefix + filename
remove := func() {
if err := dbfs.Remove(ctx, name); err != nil {
log.Warn("dbfs remove %q: %v", name, err)
}
}
f, err := dbfs.Open(ctx, name)
if err != nil {
return nil, fmt.Errorf("dbfs open %q: %w", name, err)
}
defer f.Close()
var reader io.Reader = f
if strings.HasSuffix(filename, ".zst") {
r, w := io.Pipe()
reader = r
zstdWriter, err := zstd.NewSeekableWriter(w, logZstdBlockSize)
if err != nil {
return nil, fmt.Errorf("zstd NewSeekableWriter: %w", err)
}
go func() {
defer func() {
_ = w.CloseWithError(zstdWriter.Close())
}()
if _, err := io.Copy(zstdWriter, f); err != nil {
_ = w.CloseWithError(err)
return
}
}()
}
if _, err := storage.Actions.Save(filename, reader, -1); err != nil {
return nil, fmt.Errorf("storage save %q: %w", filename, err)
}
return remove, nil
}
func RemoveLogs(ctx context.Context, inStorage bool, filename string) error {
if !inStorage {
name := DBFSPrefix + filename
err := dbfs.Remove(ctx, name)
if err != nil {
return fmt.Errorf("dbfs remove %q: %w", name, err)
}
return nil
}
err := storage.Actions.Delete(filename)
if err != nil {
return fmt.Errorf("storage delete %q: %w", filename, err)
}
return nil
}
func OpenLogs(ctx context.Context, inStorage bool, filename string) (io.ReadSeekCloser, error) {
if !inStorage {
name := DBFSPrefix + filename
f, err := dbfs.Open(ctx, name)
if err != nil {
return nil, fmt.Errorf("dbfs open %q: %w", name, err)
}
return f, nil
}
f, err := storage.Actions.Open(filename)
if err != nil {
return nil, fmt.Errorf("storage open %q: %w", filename, err)
}
var reader io.ReadSeekCloser = f
if strings.HasSuffix(filename, ".zst") {
r, err := zstd.NewSeekableReader(f)
if err != nil {
return nil, fmt.Errorf("zstd NewSeekableReader: %w", err)
}
reader = r
}
return reader, nil
}
func FormatLog(timestamp time.Time, content string) string {
// Content shouldn't contain new line, it will break log indexes, other control chars are safe.
content = strings.ReplaceAll(content, "\n", `\n`)
if len(content) > MaxLineSize {
content = content[:MaxLineSize]
}
return fmt.Sprintf("%s %s", timestamp.UTC().Format(timeFormat), content)
}
func ParseLog(in string) (time.Time, string, error) {
index := strings.IndexRune(in, ' ')
if index < 0 {
return time.Time{}, "", fmt.Errorf("invalid log: %q", in)
}
timestamp, err := time.Parse(timeFormat, in[:index])
if err != nil {
return time.Time{}, "", err
}
return timestamp, in[index+1:], nil
}
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